BRACHYDEUTERA. 163 



1. B. dimidiata LOEW. 9 Superius brunnea, inferius tota Can- 

 dida. 



On the upper side brown, on the whole under side white. Long. corp. 

 0.130.14. Long. al. 0.1417. 



Dark brown and entirely opaque on the whole upper side. In 

 well preserved specimens there are, on the upper side of the thorax, 

 two somewhat grayish-brown, approximated, longitudinal lines, 

 which commence at the anterior end of the thorax and stop before 

 reaching the posterior end; between them there is the trace of a 

 fine pale middle line, which becomes more distinct at the posterior 

 end of the thorax and is continued through the scutellum; there 

 are besides two other longitudinal lines, which, being nearer the 

 lateral border and interrupted in the neighborhood of the suture, 

 are not truncated posteriorly and continue indistinctly on the lateral 

 borders of the scutellum. Some specimens show very faint traces 

 of these markings of the thorax. The keel, resembling a nose, on 

 the upper part of the face is dark brown ; the remainder of the 

 face together with the cheeks, and the inferior half of th.e occiput, 

 breast, and pleurae, as well as the part of the upper abdominal 

 plates which are much turned downwards, are almost silvery white; 

 this color on the last abdominal segments ascends a little to the 

 upper side of the posterior borders. Legs in well-colored indi- 

 viduals blackish-brown, only the apical third of the femora and the 

 first half of the posterior tibia? being more or less reddish-brown; 

 in less distinctly colored specimens often only the tips of the tibiae 

 and the tarsi are blackish-brown, all the remainder being brownish- 

 yellow. Wings hyaline with brownish-black veins, sometimes more 

 clouded with grayish in the neighborhood of the costa ; the third 

 segment of the costa is twice and a half or three times longer than 

 the second. 



Hob. Washington. (Osten-Sacken.) 



Observation. A female sent by Poey from Cuba differs from 

 those received from Baron Osten-Sacken by its brown wing-veins 

 and clay-yellow legs, the tarsi only being of a dark-brown color ; 

 but it is only a paler colored specimen of Brachyd. diiuidiuta, 

 which became still paler in the course of time. 



